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The nucleus of the element having atomic number 25 and atomic weight 55 will contain:
(1 )25 protons and 30 neutrons
(2) 25 neutrons and 30 protons
(3) 55 protons
(4) 55 neutrons
Ans:25 protons and 30 neutrons
RUTHERFORD'S ATOMIC MODEL:- Rutherford proposed that all the positive charge and mass of the atom was concentrated in a small central region which is called the nucleus.This mo
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